15 November 1994 Simultaneous particle size, 3D position, and velocity measurements from processing of defocused images recorded with two CCD cameras
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Proceedings Volume 2248, Optical Measurements and Sensors for the Process Industries; (1994) https://doi.org/10.1117/12.194333
Event: Optics for Productivity in Manufacturing, 1994, Frankfurt, Germany
Abstract
Out of focus images recorded separately by two CCD cameras viewing the same object field are processed to measure simultaneously the size, 3-D position, and velocity of particles. The sign ambiguity of defocusing is removed by introducing a shift on the axial location of one camera with respect to the other and by using the ratio of the Fourier transforms of two defocused images. Particle sizing procedure includes mainly a calibration of the point spread function (PSF) of the optoelectronic setup for different amounts of defocusing and the measurement of both the contrast and the width at the intensity mid-point of defocused images.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Denis Lebrun, Denis Lebrun, Cafer Ozkul, Cafer Ozkul, C. E. Touil, C. E. Touil, J. B. Blaisot, J. B. Blaisot, Alain Kleitz, Alain Kleitz, } "Simultaneous particle size, 3D position, and velocity measurements from processing of defocused images recorded with two CCD cameras", Proc. SPIE 2248, Optical Measurements and Sensors for the Process Industries, (15 November 1994); doi: 10.1117/12.194333; https://doi.org/10.1117/12.194333
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